The Unforgotten — Charmaine Ross

Crippled by grief after the death of her only child, Australian police detective Allison White makes a mistake on the job that nearly gets herself and another officer killed and results in her demotion to investigating cold cases.

Angry, isolated and fighting depression, she throws herself into the work and discovers chilling similarities in a series of disappearances. She digs deeper and finds links to a mysterious charismatic leader of a secret group that might help her find answers about her own son -- if she's willing to make the ultimate sacrifice to learn the truth.

A contemporary thriller from Ellora's Cave